Economizer



May 2%, 924 1 495 J. E. BELL.

v BGONOMIZER Original Filed Nov. 7 19 nm 1 I mi i 1 8 j g F 9 Mn 8 W'wuemtoz Patented May 20, 1924.

UNITED STATES PATENT 'OFFIGE.

JOHN E. BELL, 0F BROOKLYN, NEW YORK, ASSIGNOR TO POWER SPECIALTYCOMPANY,

OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

' noonolvuznn.

February 11, 1922.

To (/71 whom if may concern.

Be it known that I. JOHN E. BELL, a citizen of the United States ofAmerica. residing at Brooklyn, in the county of Kings and State of NewYork. have invented certain new and useful Improvements iii-Economizers,of which the following is a full, clear. and exact description.

The invention upon which is based my present application for LettersPatent is an improvement applicable primarily to economize'rs for steamboilers but generally to other devices of the same type, and consists'in the improved construction and arrangement of the tubes and fittingsand their mode of support which is hereinafter more fully set forth.

This application is a division of my application Serial No. 336.284.filed on November 7, 1919.

In eeonomizers and other like apparatus generally. it is highlyimportant: to so construct and install the tubes that they may readilybe removed. individually. from their supports in case of necessity. Thisnecessity may frequently arise when by corrosion, injury or othercauses. a tube or tube section becomes impaired, and when by its removaland replacement by a new tube or tube section the integrity of thedevice. as a whole, may be preserved without the necessity of its bodilyremoval and the substitution of another complete bank of tubes.

I have devised to meet this requirement a novel form of apparatus.exemplified herein in an economizer in which the tubes are supported inside walls of cast-iron and are so constructed that they can be removed.singly or in pairs or sections therefrom. for which purpose thefollowing plan is adopted.

. The tubes are of wrought steel. and are encased or enclosed inenvelopes of cast-iron. formed, preferably. of corrugated rings shrunkonor tightly fitting the wrought steel inner tubes. These envelopescover the body orall but the ends of the tubes over the bare ends ofwhich are passed castiron disks or rings abutting closely the corrugatedenvelopes. and fitting in openings in the castiron side walls. Thesedisks are preferably so formed that the ends of the inner tubes thereinmay be expanded or flared by means of suitable tools to receive the1919', Serial No. 336,284. Divided and this application filed Serial No.535,729.

a perfect union of the return bends and tubes,-and when it is desired toremove any tube or section of tubes, these clamps are ren'ioved. thereturned bends knocked out, and the tube with its supporting disk simplywithdrawn through the openings drilled or otherwise formed inthe sidewalls,- the area of such openings being sufficient to permit the disksand enveloped tubes to pass through them.

This improvement is illustrated in the accompanying drawing in whichFig. 1 is a sectional view of a portion of a bank of tubesconstructedand supported in accordance with my invention.

Fig. 2 is an end view of a portion of an apparatus embodying myinvention.

Fig. 1 shows the general arrangement of a bank of tubes adapted for usein such a device as an economizer. These tubes are preferably of wroughtsteel and are encased in envelopes of corrugated cast-iron 2. whichenvelopes extend to near the ends of the tubes which are left bare. Theside walls of the compartment or chamber containing these tubes andthrough which the hot gases pass are formed of cast-iron sheets. plates.or sections 3. through which are drilled or otherwise formed openings.Over the bare ends of the tubes are passed cast-iron disks or rings 4.abutting closely the corrugated cast1ron envelopes 2.

In Fig. l the tubes are staggered, that is to say. alternate tubes areconnectedin series and the intermediate tubes. which he n a differentvertical plane are similarly -'con-' The ends of -the' inner tubes arefirst exnected. but thisisv a matter of design, not A panded or flaredto'fit the. openings in the disks 4: andV-shaped couplings or returnbends 8 with tapered ends are driven into the ends of the tubes to beconnected and";

then secured in position by. the clamps 7 and screws 9.

If any tube or tube section becomes injured or impaired to an extentthat renders its removal necessary, the clamps and return bend unitingthat tube to another are removed, whereupon the tube or tubes soreleased may be simply withdrawn through the openings in the side walls,and replaced by a new tube or tubes which are then joined and clamped asoriginally.

The rings 4 permit the ready withdrawal of the tubes through the plates3 and are essential where the tubes intermediate the plate-like sidewalls have a greater effective outer diameter than the extended ends ofthe tubes themselves.

In practice this improvement has many advantages the most important ofwhich will be readily recognized from the above description.

\Vhat I claim is l. An apparatus of the kind herein described,comprising in combination a bank of tubes having a greater effectivediameter intern'iediate their ends than at the ends thereof, cast-irondisks surrounding the tubes neartheir ends, side walls with openingstherein in which said disks lit, and means connecting the ends of tubesoutside said walls, which are capable of being removed or detached topermit the tubes to be withdrawn through the openings in said walls,

2. An apparatus of the kind herein described, comprising in combinationa bank of wrought steel tubes, corrugated envelopes of cast-iron inwhich said tubes are encased, cast-iron disks surrounding the tubes neartheir bare'ends, side walls with openings therein in which said disksfit, and means connecting the ends of tubes outside said walls which arecapable of being removed or detached to permit the encased tubes anddisks to be withdrawn through the openings in said walls.

3. An apparatus of the kind herein dcscribcd, comprising in combinationa bank or wrought steel tubes having a greater effective diameterintermediate their ends than at the ends thereof, cast-iron disks overthe ends of said tubes, cast-iron side walls with openings therein inwhich said disks fit, return bends connecting the open ends of tubesoutside said side walls. and clamps for securing the return bends inposition, said clamps being detachable to permit the tubes and disks tobe withdrawn through the openings in the side walls.

4. An apparatus of the kind herein described, comprising in combinationa bank of wrought steel tubes, corrugated cast-iron envelopessurrounding the body of said tubes, cast-iron disks over the bare endsof said tubes, cast-iron side walls with openings therein in whichsaiddisks fit, return bends connecting the open ends of tubes outsidesaid side walls and clamps for securing the return bends in position,said clamps being detachable to permit the enveloped tubes and disks tobe withdrawn through the open ings in the side walls.

5. An, apparatus of the kind described, comprising in combination a bankof tubes, corrugated envelopes of cast-iron in which said tubes areencased, cast-iron disks surrounding the tubes near theirbare ends, sidewalls with openings therein in which said disks tit, and header devicesdirectly connecting the ends of the tubes outside said walls, saidheader devices being capable of being removed or detached from the mainbody portion of the tube to permit encased tubes and disks to bewithdrawn through the openings in the side walls.

(3. An apparatus of the kind described, comprising in combination, abank of tubes, corrugated envelopes of cast iron in which said tubes areencased, side-walls through which the bare ends of the tubes project,disks on said tubes on an end. adjacenta sidewall; said disks fittingapertures in said will and means connecting the ends of the .tubesoutside of said walls. which are capable. of being removed or detachadto permit the encased tubes to be avithdrawn through the openings in thewall.

In testimony whereof I hereto ailix my signature.

JOHN E. BELL.

